This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A107445 #12 Jan 16 2021 06:40:57
%S A107445 1,5,198,63206,163170556,3410501048325,577465332522075000,
%T A107445 792313244775191409073200,8810729389390415079342840510816
%N A107445 Number of 4n X 4n alternating-sign matrices of type UU.
%H A107445 G. Kuperberg, <a href="https://arxiv.org/abs/math/0008184">Symmetry classes of alternating-sign matrices under one roof</a>, arXiv:math/0008184 [math.CO], 2000-2001. [A_{UU}(4n)]
%F A107445 a(n) = A005156(n)*A059489(n).
%Y A107445 Cf. A005156, A059488, A059493.
%K A107445 nonn,easy
%O A107445 0,2
%A A107445 _Paul Zinn-Justin_, May 16 2007, Jun 04 2007